FIR filter windowing methods

2013 12 2
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更新时间：2013 12 2
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Hi, I have a burning question want to ask.
Why windowing is not necessary if we have more than 100 coefficients for the FIR filter at a sampling rate of 0.1Hz?
Any hints and tips will be appreciated!

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Wayne King
Wayne King 2013-12-2

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Can you be more specific? Are you talking about designing an FIR filter using the window method or applying a window to FIR filter coefficients.
The window method for FIR filter design typically begins with some idealized response, which has an infinite impulse response, truncating that response, and then applying a window to improve things like sidelobe behavior and enforce symmetry to ensure linear phase.
So what exactly are you having trouble with?

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John
John 2013-12-2
I do understand the steps of designing a FIR filter.
However my issue is if I'm given this problem on analog filter with impulse response h(t) = e−t2.
Which will be the design step can be omitted and why?
For me I think truncating the impulse response is not necessary. Am I right?
Wayne King
Wayne King 2013-12-2
If you want to design an FIR filter, you have to have a finite number of filter taps.

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John
2013-12-2

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2013-12-2

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